javax.persistence.PersistenceException: [PersistenceUnit: NestedEmbeddableMap] Unable to build Hibernate SessionFactory

	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:1016)
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:942)
	at org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase.buildEntityManagerFactory(BaseEntityManagerFunctionalTestCase.java:77)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
	at java.util.concurrent.FutureTask.run(FutureTask.java)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.component.PojoComponentTuplizer]
	at org.hibernate.tuple.component.ComponentTuplizerFactory.constructTuplizer(ComponentTuplizerFactory.java:107)
	at org.hibernate.tuple.component.ComponentTuplizerFactory.constructDefaultTuplizer(ComponentTuplizerFactory.java:128)
	at org.hibernate.tuple.component.ComponentMetamodel.<init>(ComponentMetamodel.java:77)
	at org.hibernate.tuple.component.ComponentMetamodel.<init>(ComponentMetamodel.java:52)
	at org.hibernate.mapping.Component.getType(Component.java:227)
	at org.hibernate.tuple.PropertyFactory.buildStandardProperty(PropertyFactory.java:267)
	at org.hibernate.tuple.component.ComponentMetamodel.<init>(ComponentMetamodel.java:68)
	at org.hibernate.tuple.component.ComponentMetamodel.<init>(ComponentMetamodel.java:52)
	at org.hibernate.mapping.Component.getType(Component.java:227)
	at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:453)
	at org.hibernate.mapping.Collection.validate(Collection.java:315)
	at org.hibernate.mapping.IndexedCollection.validate(IndexedCollection.java:94)
	at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:347)
	at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:461)
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:939)
	... 15 more
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.hibernate.tuple.component.ComponentTuplizerFactory.constructTuplizer(ComponentTuplizerFactory.java:104)
	... 29 more
Caused by: org.hibernate.PropertyNotFoundException: Could not locate setter method for property [org.hibernate.test.annotations.embedded.NestedEmbeddableMap$Embedded2#a]
	at org.hibernate.internal.util.ReflectHelper.findSetterMethod(ReflectHelper.java:607)
	at org.hibernate.property.access.internal.PropertyAccessBasicImpl.<init>(PropertyAccessBasicImpl.java:44)
	at org.hibernate.property.access.internal.PropertyAccessStrategyBasicImpl.buildPropertyAccess(PropertyAccessStrategyBasicImpl.java:27)
	at org.hibernate.mapping.Property.getGetter(Property.java:308)
	at org.hibernate.tuple.component.PojoComponentTuplizer.buildGetter(PojoComponentTuplizer.java:138)
	at org.hibernate.tuple.component.AbstractComponentTuplizer.<init>(AbstractComponentTuplizer.java:47)
	at org.hibernate.tuple.component.PojoComponentTuplizer.<init>(PojoComponentTuplizer.java:41)
	... 34 more